Casio fx-85ES scientific calculator

The Casio fx-85ES is a widely recognized scientific calculator designed for students and professionals. The Casio brand was founded in Shibuya, Tokyo, Japan, in 1946 by Tadao Kashio. Initially known for producing mechanical parts and later the world's first all-electric compact calculator in 1957, the brand has become a global leader in electronics. While the brand is originally Japanese and maintained by Casio Computer Co., Ltd., its manufacturing operations are predominantly located in China, Thailand, and Malaysia to leverage global supply chain efficiencies. Casio remains an independent Japanese entity to this day, continuing to innovate in musical instruments, watches (such as G-Shock), and educational technology.